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Microstructure and diagenesis of calcified demosponges from the Upper Triassic of the northeastern Dolomites (Italy)

Published online by Cambridge University Press:  20 May 2016

A. Mastandrea  and
F. Russo
A. Mastandrea
Affiliation:
Istituto di Paleontologia, Università di Modena, via Università 4, 41100 Modena, Italy
F. Russo
Affiliation:
Istituto di Paleontologia, Università di Modena, via Università 4, 41100 Modena, Italy
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Abstract

The calcareous skeletons of 17 species of Triassic demosponges from the northeastern Dolomites have been analyzed for microstructure and diagenesis. The four microstructures recognized (irregular, spherulitic, penicillate aragonitic, and homogeneous granular Mg calcite) are described in terms of mineralogy; shape, dimension, and arrangement of microstructural elements; mode of growth; and possible biomineralization. The diagenesis in these sponge carbonate skeletons is of an aggrading type that occurred in diagenetic units, semi-closed systems, delineated by organic phragmas, which controlled the flux of diagenetic fluids. We tentatively interpret these phragmas as the remains of water-insoluble macromolecules for space delineation during the biomineralization process. In the aragonitic skeletons the preservation grade is correlated with Sr content, and the replacement of aragonite by calcite is marked by a Sr value around 4,000 p.p.m. Calcitized aragonite still retains a detectable amount of Sr. In Mg calcite skeletons the continuous and regular increase of grain size is inversely correlated with Mg content and directly with the distance from the organic phragmas.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue 3 , May 1995 , pp. 416 - 431
Copyright
Copyright © The Paleontological Society 

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